Portable rock-drill.



G. H. BIBB.

PORTABLE ROCK DRILL.

APPLICATION FILED 00117, 1910.

Patented Apr. 9, 1912.

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PM nm m NW M-r/vassas m/vs/v-ro/z 6501a,: H- 5/55 W COLUMBIA PuNOdRAPl-l co., WASHINGTON, D, c.

G. H. BIBB.

PORTABLE ROCK DRILL.

APPLIGATION FILED 001317, 1910.

1,022,578. Patented Apr. 9,-19-12.

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cuLuMmA PMNOGRAPH CO-VWASHINGTON D c GEORGE H. IBIIBB, OF SILVER-TON, COLORADO;

PORTABLE ROCK-DRILL.

Specification of Letters Patent.

Patented Apr. 9, 1912.

Application filed. October 17, 1910. Serial No. 587,556.

To all whom it may concern:

Be it known that I, GEORGE H. BIBB, a citizen of the United States, residing at Silverton, Colorado, have invented a certain new and useful Improvement in Portable Rock-Drills, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side elevation of a portable rock drill of my improved construction.

Fig. 2 is an elevation of the drill looking in the direction indicated by the arrow 2 in Fig. 1. Fig. 3-.is an elevation of the drill mounted on a tripod and adapted for open work. Fig. 4 is a vertical section taken approximately on the line H of Fig. 2. Fig. 5 is a cross section taken on the line 55 of Fig. 4.

My invention relates to a portable drill especially designed for drilling rock in either mining operations or quarry work.

The drill is particularly constructed to be operated by hand power although with slight changes it can be readily operated with a small motor or with suitable mechanical power, such as a driven belt or chain.

The particular objects of my invention are, first; to construct a light, strong and durable drill, which can be readily transported from one place to another, and quickly set up for operation; second; to construct a hand operated drill which can be readily set up and used in places where it is impossible or not feasible to use a compressor or machine drill; third; to construct a drill which can be adjusted so as to drill holes at any desired angle which is a very essential and desirable feature in the operations incident to the sinking of shafts, tunneling, stoping or raising, and fourth; to construct a drill wherein the various wear receiving parts can be readily removed when worn or broken from use, and replaced with new parts.

My invention consists primarily of a suitable support, a wheel mounted for rotation on an axle adjustably carried by the support, an adjustable drill holder, and a plurality of hammers carried by flexible arms mounted on the wheel and which hammers are adapted to successively strike with considerable force against the end of the drill, when the wheel is rotated.

My invention further consists in certain novel features of construction and arrangement of parts hereinafter more fully described and claimed.

Referring by numerals to the accompanying drawings 1 designates the body of the support which is preferably of tubular form and carried by the lower end thereof is a nut 2 in which is seated a screw rod 3. This screw rod is provided with a head 4 which may be engaged and rotatedby a suitable tool, and said head being mounted for rotation in a base block 5 which rests on the ground or upon the floor of a tunnel.

A collar 6 is adjustably arranged upon the support 1 and can be rigidly fixed at any desired height by means of a clamping screw or bolt 7. Loosely mounted on the support 1 and resting upon the collar 6 is a block 8 in which is fixed one end. of a horizontally disposed shaft 9. Mounted for rotation on the outer end of this shaft 9 is the hub 10 of the wheel, which carries the hammers of my improved drill, and which wheel is of such size and construction as to form a balance wheel which, when in operation, develops suflicient momentum to cause the hammers to strike with considerable force against the end of the drill proper. Formed on or fixed to the hub 10 is a series of radially arranged spokes 11, the outer ends 0f which diverge and are fixed to a pair of rings 12, which form the rim of the wheel. Formed on the hub 10 between the spokes 11 are sockets 13, and seated therein are the inner ends of resilient arms 14, the outer ends of which carry hammers 15. I prefer to mount the hammers 15 on the arms 14 in such a manner that they can be readily removed and replaced when they have become broken or worn through use.

An arm 16 is arranged to be removably positioned on a pair of the spokes 11 and carried by said arm is a handle 17. This construction is provided where it is desired to operate the drill by hand power, and where it is desired to operate said drill with mechanical power, a belt wheel or sprocket wheel is formed on or fixed to the outer face of the wheel as shown by dotted line in Fig. 2. In some instances it may be found desirable to connect a small electric mot-or directly to the wheel for rotating the same.

Adjustably mounted on the shaft 9 between the block 8 and the wheel is one end of an arm 18, the outer end of which is bent laterally as designated by 19, and said laterally bent portion overlies the rim or edge of the wheel. Hinged to the top of this laterally bent end 19 is a cap 20, and formed in the meeting faces of said end 19 and cap 20 are semi-circular notches 21 which form a bearing for the bushing 22, which carries the drill proper. This bushing 22 is made of mating parts, and the meeting faces of said parts are provided with semi-circular seats 23, which receive the drill proper.

The rear end of the bushing is tapered as designated by 24 and the opposite end is provided with a flange 25. The bushing 22 rotates freely in its bearing between the parts 19 and 20 and said part 20 is held in position on the part 19 by means of a bolt 26, which is pivotally mounted on the part 19 and engages in a slot formed in the free end of the cap 20.

The drill proper is of the usual type, viz; an elongated shaft or rod 27 provided with a series of longitudinally disposed grooves 28 and having one of its ends formed into a cutting head as designated by 29.

When my improved drill is set up for use the drill proper is clamped between the two parts of the bushing 22 and said bushing is loosely mounted in its bearing bet-ween the parts 19 and 20. The arm 18- is adjusted to the desired angle after which the lower end of said arm is locked to the shaft 9. The block 8, and parts carried thereby are adjusted to the desired height upon the support- 1, after which the collar 6 is locked upon said support to maintain the block in its adjusted position. The operator now manually engages the handle 17 and thereby rotates the wheel and during such movement the hammers 15 successively strike with considerable force against the rear of the drill proper, vthereby tending to force the same forward and causing the cutting head on the forward end of the drill to engage and cut into the rock or material being acted upon. The shock or blow resulting from the impact of the hammers with the rear end of the drill causessaid hammers to rebound which action is possible owing to the resiliency of the arms 14 which are formed of suitable spring material and after such rebound the hammers will swing forward by reason of th continued forward movement of the arms 14, and such movement causes each resilient arm 1% to bend as it passes beneath the laterally bent end 19, and the hammer carried by the outer end of the arm will bear against the tapered rear end of the bushing 22 and will drag along the under side of the part 19 until the hammer is free. At this point the tendency of the arm 1 1 to straighten itself combined with the momentum developed by the rapidly moving hammer causes the arm to instantly straighten itself after the hammer leaves the part 19 and as the rotation of the wheel continues the drill proper receives the blows from the hammers, which blows are delivered with great rapidity and with sufiicient force to drive the drill proper forward, thereby performing the drilling operation. The drill. proper can be rotated during the operation of the drill by the manual engagement of a small hand wheel which is detachaloly mounted on said drill proper. (See dotted lines Fig. 1.)

My improved drill can be operated with great rapidity as compared to ordinary methods of hand drilling and as said drill is comparativelylight in weight it can be readily transported from one point to another and is, therefore, of particular advantage, where a compressor or machine drill cannot be used. The arm 18 can be easily and quickly adjusted so as to project the drill proper at any desired angle, and thus the drill is adapted for use in sinking a shaft, cutting drifts or tunnels and for stoping or raising. In open construction such as railway and quarry work the shaft 9 is adjustably seated in the upper end of a tripod as seen in Fig. 3.

As hereinbefore stated my improved drill while particularly constructed to be manually operated can be operated with mechanical power, or with a small electric motor.

I claim:

1. In a machine of the class described, av vertically disposed longitudinally adjustable support, a bearing mounted for longitudinal adjustment on said support, a shaft carried by said bearing, a rotating member on the shaft, resilient arms carried by the rotating member, hammers on said resilient arms a drill holder mounted on the shaft and rotatably adjusted with respect thereto, and a drill mounted in the holder in the path of travel of the hammers.

2. In a machine of the class described, a vertically disposed longitudinally adjustable support, a bearing mounted for longitudinal adjustment upon said support, a shaft carried by said bearing, a hub journaled for rotation on said shaft, spokes carried by said hub, a pair of rings connected to the outer ends of the spokes, a series of radially arranged resilient arms carried by the hub between the spokes, which arms project beouter ends of the spokes, a series of radially for rotating the hub and parts carried 10 arranged resilient arms carried by the hub thereby.

between the spokes, which arms project be- In testimony whereof I hereunto affix my tween and beyond the rings, hammers on the signature in the presence of two witnesses, ends of the resilient arms, a drill support this 11th day of October, 1910.

carried by the shaft, a drill mounted in said GEORGE H. BIBB.

drill support, one end of Which drill is in the path of travel of the hammers, and a handle adapted to be applied to the spokes \Vitnesses M. P. SMITH, C. C. CULBER'rsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

